Copy "BarcodeWebHandler.ashx" file to the file path where the web page you want to draw UPC-A images.

Drag and drop BarcodeWebControl item to your ASPX web forms.

Run the web application to view the UPC-A barcode generated.

You can change property setting in the right-side pane or reset properties in run-time code to customize the UPC-A barcode image. And using JavaScript to change the ASP.NET UPC-A Creator web image control's src property is also supplied.